JPS5818706B2 - tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette used in a cassette type recording/reproducing device or the like.

In a tape cassette used in a tape recorder, a magnetic tape wound around a reel hub is housed in a cassette casing made up of a pair of halves.

A slippery sheet such as a tetrafluoroethylene sheet with excellent slipping effect is incorporated between the end faces on both sides of the magnetic tape in the width direction and the cassette half, and this reduces the friction generated when the magnetic tape runs. The resistance is kept low to ensure stable tape running.

The slippery sheet itself has no rigidity, making it very difficult to handle and preventing automation of tape cassette assembly.

That is, conventionally, when assembling a tape cassette, the slippery sheet was manually assembled.

This has sometimes caused accidents such as incorrect installation or multiple slippery sheets being installed one on top of the other.

Further, there is a problem that the slippery sheet falls off when the pair of halves are assembled after being assembled.

Therefore, it has been considered to provide a suction hole in the cassette half and hold the slippery sheet by vacuum suction, but if a large suction hole is provided in the cassette half, even if the suction hole is covered with a label etc. The label may become dented or torn, allowing foreign objects to enter the cassette casing.

Furthermore, if the suction holes are made smaller, the holding force of the slippery sheet will be weaker, and the slippery sheet will fall off during assembly.

It is also possible to reduce the size of the suction hole and apply suction with a large negative pressure, but this poses problems such as local deformation of the slippery sheet.

The present invention is aimed at correcting such problems, and includes storing a magnetic tape wound around a reel hub in a casing consisting of a pair of cassette halves, and storing the magnetic tape wound in the width direction of the magnetic tape. In the tape cassette in which a slippery sheet is interposed between the end face of the cassette half and the cassette half, a suction hole is provided in at least one of the pair of cassette halves, and the suction hole is continuous with the suction hole. and a relatively shallow recess facing the contact surface of the cassette half with the slippery sheet, so that the slippery sheet can be vacuum-suctioned by these suction holes and the relatively shallow recess. This relates to a tape cassette.

Therefore, according to the present invention, it is possible to reliably hold the slippery sheet without providing a large suction hole in the cassette casing.

An embodiment in which the present invention is applied to a mini cassette used in a pocket-sized ultra-compact tape recorder will be described below with reference to the drawings.

FIGS. 1 and 2 show a cover half 11 of this microcassette, and this cover half 11 is integrally molded from synthetic resin, like the base half 12 described later.

This cover half 11 is formed with a pair of reel hub shaft insertion holes 13, a cassette positioning pin, a long hole 14 for insertion of a capstan, and the like.

Further, a recess 15 for attaching a label is formed on the outer surface of the cover half 11.

Three circular holes 17 for sucking the slippery sheet 16 are formed in the recess 15.

Note that after assembly, labels will be affixed to the recesses 15 of the cover half 11 and base half 12, so that the circular suction hole 17 will be closed.

Therefore, foreign matter and dust will not enter the cassette through this circular hole 17.

When assembling a cassette using these suction holes,
As shown in FIG. 3, a pair of slippery sheets 16 interposed inside the cover half 11 and base half 12 are connected to a pipe facing the circular suction hole 17 and connected to a vacuum pump (not shown). 20. Let it be sucked and held by 21.

When assembled in this manner, the slippery sheet 16 is reliably held, and the slippery sheet 16 is prevented from falling off.

The cassette has the slippery sheet 16 between the widthwise end surface of the magnetic R-7'' 24 wound around the outer peripheral surface of the reel hub 22.23 and the inner surface of the cassette 1112.
They are assembled in such a way that they are sandwiched together.

Note that the inner diameter of the suction portions 27 and 28 of the pipes 20 and 21 is larger than the diameter of the circular suction hole 17, and for this reason, these pipes 20 and 21 are used to hold the IT sheet 16 and to close the cover. Half 11 and base half 1
2 can be held together.

That is, when the pipe 20.21 is suctioned with a vacuum pump, the slippery seam N6 comes into close contact with the inner surfaces of the cover half 11 and the base half 12, respectively, and therefore the inside of the suction portions 27, 28 of the pipe 20.21 The space 29 becomes negative pressure.

Therefore, the cover half 11 and the base half 12 are also respectively attracted and held.

Furthermore, the cassette half lL12 has a slippery sheet 1.
6, a relatively shallow recess 32 is formed which is continuous with the suction hole 17.

That is, as shown in FIGS. 4 and 5 in particular, relatively shallow four portions 32 are formed on the inner surface of the half 11.12 and are continuous with the suction through holes 17, thereby preventing the slippery sheet 16 from being suctioned. The surface area of the slippery sheet 16 is increased to ensure more secure holding of the slippery sheet 16.

Further, by providing the relatively shallow recess 32, localized large negative pressure is prevented from acting on the sheet 16, and local deformation of the slippery sheet 16 can be reduced.

Furthermore, since the suction hole 17 can be made small, even if the suction hole 17 is covered with a label, the label in this area will not become dented, stepped, or torn.

Also, since the area for holding the slippery sheet 16 has become larger,
Reliable retention speeds up assembly work.

Although the present invention has been described above with reference to Examples, the present invention is not limited to the above-mentioned Examples, and various modifications can be made based on the technical idea of the present invention.

For example, the number of circular holes 17 provided in the halves 11 and 12 is, for example, three in the cover half 11 and four in the base half 12, thereby making it possible to identify the cover half 11 and the base half 12. You may also do so.

This identification of halves 11 and 12 can also be done mechanically,
This may be done using human vision.

Furthermore, for example, the suction hole of the cover half 11 may be circular, and the suction hole of the base half 12 may be polygonal.
may be identified.

It is also possible to identify the front and rear of the cassette by arranging the suction circular holes 17 asymmetrically in the front and back directions.

As described above, the present invention provides a pair of cassettes...-7
A suction hole and a relatively shallow recess that is continuous with the suction hole and faces the contact surface with the slippery sheet of the cassette half are formed in at least one half of the cassette half. Since the slippery sheet can be vacuum-suctioned, it is possible to securely hold the slippery sheet without providing a large suction hole in the half.

Furthermore, since the slippery sheet is sucked not only in the suction hole but also in the relatively shallow recess, the slippery sheet will not be deformed due to localized negative pressure.

Furthermore, since the slippery sheet can be held securely, the speed of cassette assembly work is improved.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a mini-cassette, and FIG. 1 is a plan view of a cover half of this cassette, FIG.
The figure is a vertical sectional view of the main parts showing the assembled state of this cassette.
FIG. 4 is an enlarged longitudinal cross-sectional view of the main part, and FIG. 5 is a perspective view of the same. In addition, in the codes used in the drawings, 11...Cover half, 12...Base half, 16...
... Smooth sheet, 17 ... Circular hole for suction, 2
2... Reel hub, 23... Reel hub, 24... Magnetic tape, 32... Relatively shallow recess.

Claims (1)

[Claims] 1 A magnetic tape wound on a reel is stored in a casing consisting of a pair of cassette halves, and a slippery sheet is interposed between the widthwise end surface of the magnetic tape and the cassette halves. In the tape cassette, at least one of the pair of cassette halves has a suction hole, and a relatively shallow recess that is continuous with the suction hole and faces a contact surface of the cassette half with the slippery sheet. A tape cassette characterized in that the slippery sheet can be vacuum-suctioned by these suction holes and relatively shallow recesses.